diff --git a/novaclient/v1_1/certs.py b/novaclient/v1_1/certs.py
index b33d52134..232d7c1fd 100644
--- a/novaclient/v1_1/certs.py
+++ b/novaclient/v1_1/certs.py
@@ -37,7 +37,7 @@ class CertificateManager(base.Manager):
 
     def create(self):
         """
-        Create a x509 certificates for a user in tenant.
+        Create a x509 certificate for a user in tenant.
         """
         return self._create('/os-certificates', {}, 'certificate')